I don't think so. I'm in one of those environments where long hours are common and it definitely does happen. There are also people using a mix of uppers & downers (need the uppers to be wide awake but then can't sleep when at home hence downers). Hell I'm doing a vaguely similar thing (just with coffee and melatonin). Add a bit of anti-depressants and I don't think "cracked out of their minds" is that far fetched.
I would say its definitely a small minority though (in my workplace)...places like New York & London...not so sure.
>But I'd hardly call myself cracked out on drugs.
Well I'm sure your case is perfectly legitimate, but you've got to admit that self-assessment in this type of situation is rather unreliable.